Scalable fabrication of hierarchically structured graphite/polydimethylsiloxane composite films for large-area triboelectric nanogenerators and self-powered tactile sensing

Sun, Qijun; Lei, Yanqiang; Zhao, Xinhua; Han, Jing; Cao, Ran; Zhang, Jintao; Wu, Wei; Heidari, Hadi; Li, Wen-Jung; Roy, Vellaisamy A. L.

doi:10.1016/j.nanoen.2020.105521

Cited by 64 publications

(33 citation statements)

References 53 publications

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“…Since TENG was first proposed in 2012, [103] considerable methods have been proposed to improve the TENG output performance, among which the construction of micro-nano structures on the friction surface is an effective approach to improve the TENG output performance. [104][105][106][107] Roy et al [108] proposed a method for preparing a hierarchical microstructured graphite/PDMS composite membrane with good hydrophobicity, which can drastically elevate the open-circuit voltage (410 V), short-circuit current (42 µA), and transferred charges (160 nC) of TENG by more than 2 times. Choi et al [109] replicated the micro-nano structure which is on the surfaces of lotus leaves, rose petals, and cicada wings, respectively, and this unique surface morphology empowered TENG with better moisture resistance and improved its working performance in a relatively high humidity environment.…”

Section: Triboelectric Tactile Sensorsmentioning

confidence: 99%

Micro‐Nano Processing of Active Layers in Flexible Tactile Sensors via Template Methods: A Review

Niu

Zhang

Yue

et al. 2021

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Section: Triboelectric Tactile Sensorsmentioning

confidence: 99%

Micro‐Nano Processing of Active Layers in Flexible Tactile Sensors via Template Methods: A Review

Niu

Zhang

Yue

et al. 2021

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“…The sensitivity of the piezoelectric sensor can be expressed as S = (ΔI/I 0 )/ΔP. [38,39] Similarly, the calculation method of ΔI/I 0 is the same as that of the rate of change of capacitance.…”

Section: Performance Of the Pressure Sensormentioning

confidence: 99%

3D Printing of a Flexible Inclined‐Tip Cone Array‐Based Pressure Sensor

Pan

Yang

et al. 2021

Adv Materials Technologies

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particularly important for the detection of physiological signals. To improve the high sensitivity performance of pressure sensors, some researchers have designed special microstructure shapes-that is, pyramids, [16][17][18] ciliated microarrays, [19] inclined micropillars, [20] and convex microarrays. [21][22][23][24] Luo et al. designed a tilted micropillar structure to act as the dielectric layer of a pressure sensor using photolithography technology, [20] and improved the sensitivity of the pressure sensor by 0.42 kPa −1 through bending deformation of the tilted micropillar. Xiong et al. sputtered a gold layer microarray on a film to form a polydimethylsiloxane-gold (PDMS-Au) electrode, and placed a polyvinylidene difluoride (PVDF) film in the middle layer of the electrode to form a pressure sensor with a sandwich structure and a sensitivity of 30.2 kPa −1 . [25] Guan et al. converted natural wood into graphene-oxide-modified flexible wood through a sawing process and chemical treatment, obtaining an environmentally friendly wood pressure sensor with a sensitivity of 1.85 kPa −1 . [26] Sun et al. proposed a flexible fish-scale structure based on a PDMS/carbon nanotube (CNT) composite material, [27] the tactile electronic skin sensor developed with a high sensitivity of 12.1 kPa −1 . Although a variety of microstructure designs have improved sensor pressure sensitivity, when dealing with high pressures (>50 kPa), a single microstructure design can cause a pressure sensor to suffer from limited or saturated pressure response. This is because high-pressure sensors are not considered in the design of multi-level structures to increase the pressure test range of a sensor. [28] Moreover, they require expensive equipment and complex manufacturing processes. Consequently, pressure sensors that are designed with high sensitivity and undergo pressure testing over a wide range will become an important research topic for future studies.In this study, we used PDMS as a flexible carrier and added several conductive materials-such as carbon black (CB), CNTs, and nano-copper powder-to prepare conductive inks suitable for 3D printing. [29][30][31] To detect a wide range of pressures, the inclined-tip cone array of a flexible pressure sensor's conductive layer was designed as a three-layered structure with a stepped height. Inclined cone arrays of different heights produced more sensitive bending over a low-pressure detection range. UnderThe high sensitivity and portability of flexible pressure sensors have attracted widespread attention from researchers owing to their potential use in health monitoring and exercise detection applications. However, to improve the performance of pressure sensors, a special microstructure-shaped design is necessary, which usually requires a complicated manufacturing process. In this study, the use of 3D printing technology is proposed to develop a polydimethylsiloxane-based material along with several conductive materials-carbon black, multiwalled carbon nanotubes, and copper mixed conductive in...

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“…In addition to its role as an electrode, graphite has also been composited with PDMS to form triboelectric layers for use in TENGs. , A graphite to PDMS ratio of 2:5 could result in the highest output of the TENG, where the maximum open-circuit voltage is 410 V and the short-circuit current is 42 μA.…”

Section: Inorganic Nanomaterials Used In Tengsmentioning

confidence: 99%

Advances in Inorganic Nanomaterials for Triboelectric Nanogenerators

Zhang

Olin

2021

ACS Nanosci. Au

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Triboelectric nanogenerators (TENGs) that utilize triboelectrification and electrostatic induction to convert mechanical energy to electricity have attracted increasing interest in the last 10 years. As a universal physical phenomenon, triboelectrification can occur between any two surfaces that experience physical contact and separation regardless of the type of material. For this reason, many materials, including both organic and inorganic materials, have been studied in TENGs with different purposes. Although organic polymers are mainly used as triboelectric materials in TENGs, the application of inorganic nanomaterials has also been intensively studied because of their unique dielectric, electric, piezoelectric, and optical properties, which can improve the performance of TENGs. A review of how inorganic nanomaterials are used in TENGs would help researchers gain an overview of the progress in this area. Here, we present a review to summarize how inorganic nanomaterials are utilized in TENGs based on the roles, types, and characteristics of the nanomaterials.

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Scalable fabrication of hierarchically structured graphite/polydimethylsiloxane composite films for large-area triboelectric nanogenerators and self-powered tactile sensing

Cited by 64 publications

References 53 publications

Micro‐Nano Processing of Active Layers in Flexible Tactile Sensors via Template Methods: A Review

Micro‐Nano Processing of Active Layers in Flexible Tactile Sensors via Template Methods: A Review

3D Printing of a Flexible Inclined‐Tip Cone Array‐Based Pressure Sensor

Advances in Inorganic Nanomaterials for Triboelectric Nanogenerators

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